In a heavy bottom pot, heat the milk with 1 tsp sugar and vanilla essence/vanilla bean until a little bubbly but NOT over heat it. Switch off the heat.

In a separate mixing bowl, beat egg yolks, sugar and corn starch. Beat it well.

Pour half of the milk mixture carefully and slowly into egg mixture. Whisk them well.

Add the egg mixture into the other half of milk in the pot.

Slowly heat the mixture for 2-4 minutes until it is thickened and keep whisking it to avoid the bottom part get burned.

Switch off the heat. Strain the custard mixture into fresh bowl.

The next day. Prepare the biscuit. Mash the oreo/chocolate cookies, butter cookies, peanuts in food processor/mortar pestle.

Add the melted margarine/butter in each mashed cookies.

Get a glass/bowl, assembly the layered custard as your wish. Garnish it as your wish.

Other options: you may use the custard for fruits; exchange the cookies with granola, muesli, cornflakes, fruit puree.

Chill it in the fridge for 2 hours or serve it rightaway.